Ok, since the ignition lead has been repaired, I would be changing it for a new or second hand coil, unless the repair is perfectly insulated, and the replacement part of lead made from the right material they never run right.
To get at the coil, you simply, drain the fuel tank, remove the blade plate and 4 bolts holding the engine on.
After that the flywheel should have tin cover over it which just comes off, under there you will find the coil.
